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Huỳnh Quang Vũ (2012). Lecture notes on Topology. Ho Chi Minh city University of Science.
Colin Adams, Robert Franzosa (ngày 28 tháng 6 năm 2007), Introduction to Topology: Pure and Applied.
Victor Bryant, Metric Spaces: Iteration and Application, Cambridge University Press, 1985, ISBN 0-521-31897-1.
Dmitri Burago, Yu D Burago, Sergei Ivanov, A Course in Metric Geometry, American Mathematical Society, 2001, ISBN 0-8218-2129-6.
Athanase Papadopoulos, Metric Spaces, Convexity and Nonpositive Curvature, European Mathematical Society, 2004, ISBN 978-3-03719-010-4.
Mícheál Ó Searcóid, Metric Spaces, Springer Undergraduate Mathematics Series, 2006, ISBN 1-84628-369-8.
Lawvere, F. William, "Metric spaces, generalized logic, and closed categories", Rend. Sem. Mat. Fis. Milano 43 (1973), 135—166 (1974); (Italian summary)

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